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Author the dead horse equation lives!
William Stacy

2006-01-11, 1:02 am

I plucked this off an old dejanews archive(from sci.med.vision in the
mid 1990s, which feels remarkably like the s.m.v. of today!):

log10 (VA) = -1.3534 (log10(-D)) - 0.5068,
where VA = decimal form of Snellen VA, D = myopia in dioptres


for all you refractionist wannabes who think only myopia exists
William Stacy

2006-01-11, 1:02 am

Or Ray Chamberlain's simplified verson, posted around 1997:

Correction in Diopters = log(20/xxx) / .43
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